Ploting a function and its roots
조회 수: 3 (최근 30일)
이전 댓글 표시
f=@(x)x.^2-5*sin(x);
[p1,p2]=fzero(f,1,[-1,3])
fplot(f1,[-1,3])
Can I "draw" the roots p1,p2 in the same function fplot?
댓글 수: 0
채택된 답변
Star Strider
2018년 7월 5일
The fzero function will only return one value for each initial estimate. You need to provide different initial estimates in different calls to it, if you want other roots. (For several roots, this usually requires a for loop.) Plotting the results is then straightforward.
Try this:
f=@(x)x.^2-5*sin(x);
p1 = fzero(f,1);
p2 = fzero(f,5);
fplot(f,[-1,3])
hold on
plot([p1,p2], [0 0], 'p')
hold off
댓글 수: 2
Star Strider
2018년 7월 5일
Yes. However it is subject to the same initial estimate constraints, so that different initial estimates can result in different zeros and different parameter estimates, at least in my experience. The difference is that fsolve (link) finds parameters defining roots of systems of functions, and is not limited to single functions, as is fzero.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Calculus에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!